Re: [R-sig-Geo] R: suggestion to write a more elegant code

Alexander Brenning Thu, 16 Oct 2008 18:18:12 -0700

how about this...

power<- seq(1.5, 4.0, by=0.1)
for (i in 1:length(power)){
    rsaga.grid.calculus(in.grids = c("DCM_1.sgrd"),
          out.grid = paste("DCM_1_power",i,".sgrd",sep=""),
          formula = paste("a^",power[i],sep=""))
}





Alessandro wrote:

Hi Thanx Alex and Mike

SORRY I am a brand-new

I tried this formula


for (pow in seq(1.5, 4.0, by = 0.1))
     rsaga.grid.calculus(in.grids = c("DCM_1.sgrd"),
          out.grid = "DCM_1_power15.sgrd",
          formula = paste("a^", pow, sep=""))

but the code create only one raster (DCM_1_power15.sgrd)

with this formula I have this error

power<- seq(1.5, 4.0, by=0.1)
for (i in 1:length(power)){
rsaga.grid.calculus(in.grids = c("DCM_1.sgrd"),out.grid
=paste("DCM_1_power"power[i]*10,".sgrd",sep=""), formula = ~^power[i])
}

ERROR message


power<- seq(1.5, 4.0, by=0.1)

for (i in 1:length(power)){

+ rsaga.grid.calculus(in.grids = c("DCM_1.sgrd"),out.grid
=paste("DCM_1_power"power[i]*10,".sgrd",sep=""), formula = ~^power[i])
Errore: unexpected symbol in:
"for (i in 1:length(power)){
rsaga.grid.calculus(in.grids = c("DCM_1.sgrd"),out.grid
=paste("DCM_1_power"power"

Errore: unexpected '}' in "}"




-----Messaggio originale-----

Da: Alexander Brenning [mailto:[EMAIL PROTECTED]Inviato: giovedì 16 ottobre 2008 17.01

A: Alessandro
Cc: r-sig-geo@stat.math.ethz.ch
Oggetto: Re: [R-sig-Geo] suggestion to write a more elegant code

Hi,

first, your formulas should read ~a^1.4 etc.; 'a' represents the first(and in your case only) grid in in.grids.


Instead of using a formula, you can use a character string:
   formula = "a^1.5" etc.,
so you just have to 'paste' things together; this should work:

for (pow in seq(1.5, 4.0, by = 0.1))
     rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),
          out.grid = "DCM_1_power15.sgrd",
          formula = paste("a^", pow, sep=""))

Cheers
  Alex



Alessandro wrote:

Hi all,

I need a suggestion to write this code in R more elegant . I have a  DSM
grid and I need to create a different grid raisin to different power.

Thanx Ale

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^1.5)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power16.sgrd", formula = ~^1.6)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power17.sgrd", formula = ~^1.7)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power18.sgrd", formula = ~^1.8)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power19.sgrd", formula = ~^1.9)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^2.0)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power20.sgrd", formula = ~^2.1)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^2.2)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^2.3)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^2.4)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^2.5)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^1.6)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^2.7)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^2.8)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^2.9)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^3.0)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^3.1)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^3.2)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^3.3)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^3.4)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^3.5)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^3.6)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^3.7)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^3.8)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^3.9)

rsaga.grid.calculus(in.grids = c("DSM_1.sgrd"),out.grid =
"DCM_1_power15.sgrd", formula = ~^4.0)


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--
Alexander Brenning
[EMAIL PROTECTED] - T +1-519-888-4567 ext 35783
Department of Geography and Environmental Management
University of Waterloo
200 University Ave. W - Waterloo, ON - Canada N2L 3G1
http://www.fes.uwaterloo.ca/geography/faculty/brenning/

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Re: [R-sig-Geo] R: suggestion to write a more elegant code

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